Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie o consorte que se tornou para o casamento de 4 de abril de 1721.
 ###Tabelas: CREATE TABLE list_of_contents (list_of_contents_id AUTO_INCREMENT PRIMARY KEY, Standard order INT, English translation VARCHAR, Transcription (based on Pinyin) VARCHAR, Traditional Chinese VARCHAR, Simplified Chinese VARCHAR) CREATE TABLE house_of_oldenburg (house_of_oldenburg_id AUTO_INCREMENT PRIMARY KEY, Birth VARCHAR, Marriage VARCHAR, Became Consort VARCHAR, Ceased to be Consort VARCHAR, Death VARCHAR, Spouse VARCHAR) CREATE TABLE title_holders_from_1973_until_1991 (title_holders_from_1973_until_1991_id AUTO_INCREMENT PRIMARY KEY, Year INT, Binibining Pilipinas-Universe VARCHAR, Binibining Pilipinas-International VARCHAR, Miss Maja Pilipinas VARCHAR, Binibining Pilipinas-Tourism VARCHAR, First runner-up VARCHAR, Second runner-up VARCHAR) CREATE TABLE operation (operation_id AUTO_INCREMENT PRIMARY KEY, Maximum Ceiling Temperature VARCHAR, Temperature Rating VARCHAR, Temperature Classification VARCHAR, Color Code (with Fusible Link) VARCHAR, Glass Bulb Color VARCHAR) CREATE TABLE year_by_year (year_by_year_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Coach VARCHAR, Conf. Record VARCHAR, Overall VARCHAR, Standings VARCHAR, Postseason VARCHAR)  
SELECT Became Consort FROM house_of_oldenburg WHERE Marriage = 4 april 1721